Abstract

Waste tyre generation in South Africa is one of the issues that have not found a sustainable solution. Approximately 1.5 billion tyres are produced annually around the world, and South Africa contributes about 11 million tyres accounting to about 177 835 tons of waste annually. Numerous technologies have been used as possible pathways to recycle waste tyres. This review analyzes the main advances in waste tyre pyrolysis and gasification technologies and lists challenges and successes. For waste tyre pyrolysis, recovering high-value products such as limonene, benzene, xylene, and activated carbon can make the process profitable. For gasification, the objective of new studies is for the producer gas to have a desirable composition for further application in the production of chemicals, heat and power and synthesis of liquid fuels. Also, more research is required to fill the gap in the optimum conditions for solar integrated pyrolysis and gasification of waste tyres. A comprehensive comparative techno-economic analysis of chemicals production from waste tyre via gasification is required to determine the most commercially viable route for tyres.

摘要

南非的废轮胎产生是尚未找到可持续解决方案的问题之一。全世界每年生产约 15 亿条轮胎，南非贡献了约 1100 万条轮胎，每年产生约 177835 吨废物。许多技术已被用作回收废轮胎的可能途径。本综述分析了废轮胎热解和气化技术的主要进展，并列出了挑战和成功。对于废旧轮胎热解，回收柠檬烯、苯、二甲苯和活性炭等高价值产品可以使该过程盈利。对于气化，新研究的目的是使生产气体具有理想的成分，以进一步应用于化学品、热力和电力的生产以及液体燃料的合成。还，需要更多的研究来填补太阳能综合热解和废轮胎气化的最佳条件的空白。需要对通过气化从废轮胎生产化学品进行全面的比较技术经济分析，以确定最商业上可行的轮胎路线。